264397639 has 4 divisors (see below), whose sum is σ = 288433800. Its totient is φ = 240361480.

The previous prime is 264397631. The next prime is 264397687. The reversal of 264397639 is 936793462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 264397639 - 2³ = 264397631 is a prime.

It is a super-2 number, since 2×264397639² = 139812223017548642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 264397592 and 264397601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264397631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12018064 + ... + 12018085.

It is an arithmetic number, because the mean of its divisors is an integer number (72108450).

Almost surely, 2^264397639 is an apocalyptic number.

264397639 is a deficient number, since it is larger than the sum of its proper divisors (24036161).

264397639 is a wasteful number, since it uses less digits than its factorization.

264397639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24036160.

The product of its digits is 1469664, while the sum is 49.

The square root of 264397639 is about 16260.3086994067. The cubic root of 264397639 is about 641.8287854231.

The spelling of 264397639 in words is "two hundred sixty-four million, three hundred ninety-seven thousand, six hundred thirty-nine".